Chlorine disinfection studies have been conducted on a treated wastewater. For the results given below: a) Determine the bacterial decay coefficient k and the dilution constant n for each initial dosage; b) Determine the contact time necessary to attain a 99% kill at the three chlorine dosage.

Chlorine disinfection studies have been conducted on a treated wastewater. For the results given below: a) Determine the bacterial decay coefficient k and the dilution constant n for each initial dosage; b) Determine the contact time necessary to attain a 99% kill at the three chlorine dosage.

Chlorine Dosage, Percent Survival at Specified Contact Time

mg/l 1min 2 min 4 min 8 min 16 min

50 94 80 43 20 8

80 60 35 30 10 2

100 82 41 15 2.8 0.5